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Aerial spraying and dusting in agriculture
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20
Agricultural engineering
10
Pesticides
9
Pests -- Control
9
Agriculture -- Research
7
Airplanes
7
Crop science
6
Agricultural machinery
5
Agriculture -- Economic aspects
5
Cotton
5
Cotton -- Diseases and pests
5
Federal aid to research
5
Spraying equipment
3
Boll weevil
2
Fungicides
2
Orchards
2
Agricultural experiment stations
1
Agricultural facilities
1
Calcium arsenate
1
Crops
1